1. Department of Food Science and Human Nutrition, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611
2. Division of Gastroenterology and Nutrition, College of Medicine, University of Florida, Gainesville, FL 32611
3. Veterans Administration Medical Center and Division of General Medicine, University of Florida, Gainesville, FL 32611
4. Division of Clinical Nutrition, School of Medicine, University of California, Davis, CA 95616